SQL获取本周销售总数

    select sum("NUMBER") as WEEK_NUMBER, COMPANY_CODE, PROJECT_CODE
		from D_VISIT 
		WHERE "DATE" >= (TO_DATE('2014-03-29','yyyy-mm-dd') - (mod(TO_NUMBER(to_char(TO_DATE('2014-03-29','yyyy-mm-dd'),'D'))+7-2,7))  ) 
    AND "DATE" <= TO_DATE('2014-03-29','yyyy-mm-dd')
    group by COMPANY_CODE, PROJECT_CODE 

　　主要是计算本周的算法哈